# Movement and Position

## Movement and Position

### Distance

• Distance is a scalar quantity representing how much ground an object has covered during its motion.
• Distance does not take into account the direction of the motion.
• It’s measured in metres (m).

### Displacement

• Displacement is a vector quantity representing the object’s overall change in position.
• Displacement takes into account the direction of the motion.
• It’s measured in metres (m) as well, but with an attached direction (north, south, east, west, etc.).

### Speed

• Speed is the rate at which an object covers distance.
• A fast-moving object has a high speed and covers a large distance in a short amount of time.
• Average speed can be calculated by dividing the total distance travelled by the total time taken.

### Velocity

• Velocity is a vector quantity representing the rate at which an object changes its position.
• It takes into account direction, unlike speed.
• Average velocity can be calculated by dividing total displacement by the total time taken.

### Time

• Time is a scalar quantity measured in seconds (s).
• It’s used in calculations of both speed and velocity.

### Acceleration

• Acceleration is a vector quantity that represents the rate of change of velocity of an object within a certain period of time.
• It is measured in metres per second squared (m/s²).
• It occurs when an object speeds up, slows down, or changes direction.

### Motion Graphs

• Motions of objects can be represented using motion graphs, including distance-time graphs and velocity-time graphs.
• A horizontal line on a distance-time graph suggests the object is stationary.
• A sloping line on a distance-time graph indicates steady speed, and the steepness of the slope represents the speed.
• A curving line on a distance-time graph indicates acceleration or deceleration.
• The gradient on a velocity-time graph represents the acceleration. A horizontal line shows steady speed.

Becoming confident in these concepts and definitions will aid in understanding more complex principles involved in forces and motion.